I don’t think the size of the font files in the repository is a significant
issue; are the sizes particularly huge compared to the total size of all the
layout tests including expected results? If this was a problem, we could come
up with some other way of having the test machinery download the fonts, but I
think the complexity of that is not justified to solve a problem that may be a
non-problem.
Aside from the size of the font files, it seems like we have at least three
separate issues:
1) To make MathML work really well, platforms need to include appropriate
fonts. As you said, this is not a WebKit decision, but a decision made by
platform owners. If we want to advise them about the importance of this, it
would be good to draft something explaining how we, the WebKit project, see
this requirement and give advice on what to do. Someone should write a draft of
this recommendation so we can put it somewhere on webkit.org, and also so we
can discuss and make sure we agree on this advice. I’d like to see this written
in the form of a recommendation so we can see if this is really a practical
request. To give one example, “please use STIX Math, but version 2 which is not
out yet” isn’t a great recommendation.
2) Since many people will be using WebKit on existing systems, it also seems
important to design and to test what MathML does when these fonts are not
present. It’s not enough to say “they should include the fonts”; we need to
figure out what behavior we want, and test that the implementation does what we
want. This means that we do *not* want to run all tests with these extra fonts.
We need to test what will actually happen for users. I don’t think it’s right
for the WebKit project to just take the stance, “it will look wrong when the
fonts are not there”. Lets figure out what we are trying to do in that case. I
could even imagine deciding something radical like deciding that the browser
should not even expose the MathML elements if suitable fonts aren’t present.
3) For OS X and also iOS, we would like to test MathML with fonts that are
currently not included with the OS; testing the “best case” version of MathML
even if it’s not available in practice to OS X and iOS users at this time. The
test runners for OS X and iOS already have code to activate fonts provided in
font files for testing purposes. That’s done by the activateFonts function in
ActivateFontsCocoa.mm, and the activateTestingFonts and activateFontsIOS
functions in DumpRenderTree.mm. Currently this turns the fonts on
unconditionally for all tests and so would get in the way (2) above. Note that
there is also a mechanism alongside this called PLATFORM_FONT_LOOKUP, increases
consistency of regression test results by blocking all fonts except for the
ones on a whitelist, and so if the font is not listed in that whitelist it will
be blocked.
— Darin
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